/Engine/Source/Runtime/Experimental/Iris/Core/Public/Iris/ReplicationState/ReplicationStateDescriptor.h
AFNetSerializeris needed for replication support of a certain type. Most types that can be marked as UPROPERTY are already supported. Types that aren't supported or need special support will emit warnings when descriptors are built for a UCLASS, USTRUCT or UFUNCTION. Find below how to implement one.
namespace UE { namespace Net { enum EReplicationStateMemberTraits { None = 0U, HasDynamicState = 1U << 0U, HasObjectReference = HasDynamicState << 1U, HasConnectionSpecificSerialization = HasObjectReference << 1U, HasRepNotifyAlways = HasConnectionSpecificSerialization << 1U, UseSerializerIsEqual = HasRepNotifyAlways << 1U, } } }